JP5239150B2 - Bone conduction speaker - Google Patents

Bone conduction speaker Download PDF

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JP5239150B2
JP5239150B2 JP2006329001A JP2006329001A JP5239150B2 JP 5239150 B2 JP5239150 B2 JP 5239150B2 JP 2006329001 A JP2006329001 A JP 2006329001A JP 2006329001 A JP2006329001 A JP 2006329001A JP 5239150 B2 JP5239150 B2 JP 5239150B2
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bone conduction
voice coil
magnet
diaphragm
recess
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JP2008147732A (en
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任徳 中谷
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コスモギア株式会社
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本発明は骨伝導スピーカーに係わり、より詳しくは、骨伝導の効率を維持しつつ、小型化、軽量化を図ることができ、製造コストも低減できる骨伝導スピーカーに関する。   The present invention relates to a bone conduction speaker. More specifically, the present invention relates to a bone conduction speaker that can be reduced in size and weight while maintaining the efficiency of bone conduction, and can reduce the manufacturing cost.
通常、音波で伝えられる音の振動は耳の中にある鼓膜へ伝達される。鼓膜の中にある三つの骨(耳小骨)があるが、鼓膜の振動はこの骨を通じてネジのような蝸牛に伝達される。蝸牛にはリンバ液があり、このリンパ液の振動が電気信号に変わりながら聴覚神経に伝達され、脳が音を認識する。これに対して、骨伝導とは、上記メカニズムにおける振動が鼓膜と耳小骨を経由する過程を省略したものである。すなわち、音の振動が頭蓋骨を通じて直接蝸牛に送られ、鼓膜や耳小骨に異常がある難聴者等であっても、蝸牛や聴覚神経が正常であればこの骨伝導により確実に音を聞くことができる。この原理を応用したスピーカーが骨伝導スピーカー(たとえば、特許文献1参照。)である。   Usually, sound vibrations transmitted by sound waves are transmitted to the eardrum in the ear. There are three bones (ear ossicles) in the eardrum, and the vibration of the eardrum is transmitted to the cochlea like a screw through this bone. The cochlea has limba fluid, and the vibration of this lymph fluid is transmitted to the auditory nerve while turning into an electrical signal, and the brain recognizes the sound. On the other hand, bone conduction omits the process in which the vibration in the above mechanism passes through the eardrum and the ossicle. That is, sound vibrations are sent directly to the cochlea through the skull, and even hearing-impaired people with abnormalities in the eardrum or ear ossicles can hear the sound reliably through this bone conduction if the cochlea and auditory nerve are normal. it can. A speaker applying this principle is a bone conduction speaker (see, for example, Patent Document 1).
骨伝導スピーカーはかなりの多様な種類が開発されているが、従来のものは、ケース基台、ヨーク、マグネット、ボイスコイル及び振動部材で成り立っている。また、殆どの振動部材は多数のプレートが相互積み重ねた形態をしており、また、マグネットはボイスコイル側部に並んで配置される。したがって、従来の骨伝導スピーカーは、普通のヘッドホンやイヤホンに比べて幅広で大きく重いといった問題があった。また、そのような構造に伴い、製造工程も複雑でコストが高く、単価が高くなる問題があった。   Although a wide variety of bone conduction speakers have been developed, the conventional one is composed of a case base, a yoke, a magnet, a voice coil, and a vibration member. Most vibration members have a form in which a large number of plates are stacked on top of each other, and the magnets are arranged side by side on the side of the voice coil. Therefore, the conventional bone conduction speaker has a problem that it is wider and heavier than ordinary headphones and earphones. In addition, with such a structure, there is a problem that the manufacturing process is complicated and expensive, and the unit price is high.
特に、近年においては、骨伝導スピーカーも携帯電話やMP3プレーヤーに装着して使用できるように小型化および軽量化が要求されているが、現在、骨伝導の効率を低下させずに小型化および軽量化を実現したものは何ら提供されていないのが実情である。   In particular, in recent years, bone conduction speakers have been required to be smaller and lighter so that they can be used by attaching them to mobile phones and MP3 players. However, at present, they are smaller and lighter without reducing the efficiency of bone conduction. The reality is that nothing has been realized.
特開2003−340370号公報JP 2003-340370 A
そこで、本発明が前述の状況に鑑み、解決しようとするところは、骨伝導の効率を維持しつつ、小型化及び軽量化を図ることができ、製造工程も簡略化でき、製造コストを低減できる骨伝導スピーカーを提供する点にある。   Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem that it is possible to reduce the size and weight while maintaining the efficiency of bone conduction, simplify the manufacturing process, and reduce the manufacturing cost. The point is to provide a bone conduction speaker.
本発明は、前述の課題解決のために、略円形の底面を有する凹部が形成されたケース基台と、前記凹部内に収納されるボイスコイルと、前記ケース基台における前記凹部の内壁を構成する固定部に取り付けられ、前記凹部に収納されたボイスコイルの上側に渡設される振動板と、該振動板の上面側の略中央位置に取り付けられたマグネットと、前記ケース基台の上部に取り付けられる蓋体と、より構成したことを特徴とする骨伝導スピーカーを構成した。   In order to solve the above-mentioned problems, the present invention comprises a case base in which a recess having a substantially circular bottom surface is formed, a voice coil housed in the recess, and an inner wall of the recess in the case base. A diaphragm attached to the fixed portion that extends over the voice coil housed in the recess, a magnet attached to a substantially central position on the upper surface side of the diaphragm, and an upper portion of the case base The bone conduction speaker characterized by having comprised the lid body attached and comprising was comprised.
ここで、前記凹部底面の略中央部より上方に突起するポールビスを当該ケース基台と一体に設け、該ポールビスの周囲に前記ボイスコイルを配置したものが好ましく、具体的には、前記ポールビスを、金属材料を用いて前記ケース基台とともに一体成形すればよい。   Here, it is preferable that a pole screw projecting upward from a substantially central portion of the bottom surface of the recess is provided integrally with the case base, and the voice coil is disposed around the pole screw, specifically, the pole screw is What is necessary is just to integrally mold with the said case base using a metal material.
また、前記凹部の内壁面を、収納されるボイスコイルの外周面に略平行な曲面に形成したものが好ましい。   Further, it is preferable that the inner wall surface of the concave portion is formed into a curved surface substantially parallel to the outer peripheral surface of the voice coil to be accommodated.
また、前記振動板におけるマグネット取付位置の周囲に沿って、上下貫通した少なくとも1つの長穴を設けたものが好ましい。   Further, it is preferable that at least one long hole penetrating vertically is provided along the periphery of the magnet mounting position on the diaphragm.
さらに、前記マグネットが直方体であり、前記蓋体の内面側に該マグネットの上面から側面の少なくとも一部までを覆う金属製カバーを設ける。この金属製カバーは、好ましくは磁性体材料より構成される。そして、前記蓋体内面の対応する位置に、前記金属製カバーに覆われたマグネットを受け入れる凹陥部が設けられる。 Furthermore, the magnet is a rectangular parallelepiped, and a metal cover that covers from the upper surface of the magnet to at least a part of the side surface is provided on the inner surface side of the lid. This metal cover is preferably made of a magnetic material. And the recessed part which receives the magnet covered with the said metal cover is provided in the position corresponding to the said cover inner surface.
また、前記凹部を挟み互いに対向する位置に一対の前記固定部を設け、前記振動板の両端部を各固定部の上面にそれぞれ固定した構造が好ましい。   Further, it is preferable that a pair of the fixing portions are provided at positions facing each other with the concave portion interposed therebetween, and both end portions of the diaphragm are fixed to the upper surface of each fixing portion.
以上にしてなる本願発明の骨伝導スピーカーによれば、ボイスコイルの上側に渡設される振動板の上面略中央位置にマグネットを取り付けた構造であり、複雑な取付構造を必要とすることなく、各構成要素の軽量、小型化によって、全体の軽量、小型が容易となり、製造工程も簡単で、製造コストを低減できる。とくに、マグネットがボイスコイルの側方に位置しないので、携帯電話やPDA、MP3プレーヤーなどのような小型電子機器にも容易に連結して使用することが出来る程度に、十分な小型化が可能となる。   According to the bone conduction speaker of the present invention formed as described above, it is a structure in which a magnet is attached to a substantially central position on the upper surface of the diaphragm provided on the upper side of the voice coil, without requiring a complicated attachment structure, By reducing the weight and size of each component, the overall weight and size can be easily reduced, the manufacturing process can be simplified, and the manufacturing cost can be reduced. In particular, since the magnet is not located on the side of the voice coil, it can be made small enough to be easily connected to a small electronic device such as a mobile phone, PDA, or MP3 player. Become.
また、ケース基台にポールビスが形成され、ここにボイスコイルが配置され、その上部に振動板及びマグネットが位置される構造であるので、ボイスコイルの側方にマグネットを配置しなくても、骨伝導の効率は低下せず、十分な効率を維持できる。   In addition, a pole screw is formed on the case base, a voice coil is arranged here, and a diaphragm and a magnet are positioned on the upper part. Therefore, even if no magnet is arranged on the side of the voice coil, the bone The efficiency of conduction is not lowered, and sufficient efficiency can be maintained.
また、凹部底面の略中央部より上方に突起するポールビスを当該ケース基台と一体に設け、該ポールビスの周囲に前記ボイスコイルを配置したので、小型化に対応しつつ優れた骨伝導効率を維持でき、とくに、ポールビスを、金属材料を用いて前記ケース基台とともに一体成形すれば、製造効率が向上し、更なるコスト低減が可能となる。   In addition, a pole screw that protrudes above the approximate center of the bottom of the recess is integrated with the case base, and the voice coil is placed around the pole screw, maintaining excellent bone conduction efficiency while supporting downsizing. In particular, if the pole screw is integrally formed with the case base using a metal material, the manufacturing efficiency can be improved and the cost can be further reduced.
また、前記凹部の内壁面を、収納されるボイスコイルの外周面に略平行な曲面に形成したので、ボイスコイルの振動を阻害することなく、優れた振動効率を維持できる。   In addition, since the inner wall surface of the concave portion is formed into a curved surface substantially parallel to the outer peripheral surface of the stored voice coil, excellent vibration efficiency can be maintained without impairing vibration of the voice coil.
また、前記振動板におけるマグネット取付位置の周囲に沿って、上下貫通した少なくとも1つの長穴を設けたので、振動板の振幅を大きくして骨伝導効率を高めることができる。   In addition, since at least one elongated hole penetrating vertically is provided along the periphery of the magnet mounting position on the diaphragm, the amplitude of the diaphragm can be increased to increase bone conduction efficiency.
また、前記マグネットが直方体であり、前記蓋体の内面側に該マグネットの上面から側面の少なくとも一部までを覆う金属製カバー、とくに磁性体材料より構成される金属製カバーを設けたので、マグネットの磁気線をボイスコイル側へ集中させて振動効率を高めることができるとともに、外部への磁力線の露出を防止し、骨伝導スピーカーから発生される磁気力の影響を人体に及ぼさないように遮断できる。 Further, the magnet is a rectangular parallelepiped, and a metal cover that covers from the upper surface of the magnet to at least a part of the side surface, particularly a metal cover made of a magnetic material, is provided on the inner surface side of the lid body. Concentrate the magnetic lines on the voice coil side to increase the vibration efficiency, prevent the exposure of magnetic field lines to the outside, and block the influence of the magnetic force generated from the bone conduction speaker so that it does not affect the human body .
また、前記蓋体内面の対応する位置に、前記金属製カバーに覆われたマグネットを受け入れる凹陥部を設けたので、当該蓋体を介して骨伝導を人体に効率よく伝達できる。   Moreover, since the recessed part which receives the magnet covered with the said metal cover was provided in the position corresponding to the said cover body inner surface, bone conduction can be efficiently transmitted to a human body through the said cover body.
また、前記凹部を挟み互いに対向する位置に一対の前記固定部を設け、前記振動板の両端部を各固定部の上面にそれぞれ固定したので、簡単な構造により凹部内のボイスコイルの振動を確実に振動板に伝えることができる構造が実現する。   In addition, a pair of the fixing portions are provided at positions facing each other across the recess, and both end portions of the diaphragm are fixed to the upper surface of each fixing portion, so that the vibration of the voice coil in the recess can be reliably ensured by a simple structure. A structure that can be transmitted to the diaphragm is realized.
次に、本発明の実施形態を添付図面に基づき詳細に説明する。   Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
図1は、本発明の代表的実施形態に係る骨伝導スピーカーを示す斜視図であり、図2は縦断面図、図3は分解断面図、図4は分解斜視図である。図中符号1は骨伝導スピーカー、2はケース基台、3はボイスコイル、4は振動板、5はマグネット、6は金属製カバー、7は蓋体をそれぞれ示している。   1 is a perspective view showing a bone conduction speaker according to a representative embodiment of the present invention, FIG. 2 is a longitudinal sectional view, FIG. 3 is an exploded sectional view, and FIG. 4 is an exploded perspective view. In the figure, reference numeral 1 is a bone conduction speaker, 2 is a case base, 3 is a voice coil, 4 is a diaphragm, 5 is a magnet, 6 is a metal cover, and 7 is a lid.
骨伝導スピーカー1は、図2〜4に示すように、略円形の底面20を有する凹部25が形成されたケース基台2と、凹部25内に収納されるボイスコイル3と、ケース基台2における前記凹部25の内壁23を構成する固定部22に取り付けられ、凹部25に収納されたボイスコイル3の上側に渡設される振動板4と、該振動板4の上面側の略中央位置40に取り付けられたマグネット5と、ケース基台2の上部に取り付けられる蓋体7とより構成されている。   2 to 4, the bone conduction speaker 1 includes a case base 2 in which a recess 25 having a substantially circular bottom surface 20 is formed, a voice coil 3 housed in the recess 25, and a case base 2. The diaphragm 4 is attached to the fixed portion 22 constituting the inner wall 23 of the concave portion 25 and is provided on the upper side of the voice coil 3 accommodated in the concave portion 25, and the substantially central position 40 on the upper surface side of the diaphragm 4. And a lid 7 attached to the upper part of the case base 2.
ケース基台2の凹部底面20の略中央部には、上方に突起するポールビス21が配置されている。このポールビス21は、ケース基台2と一体に設けられ、該ポールビス21の周囲にボイスコイル3が配置される。また、ケース基台2の前記凹部25を挟んで互いに対向する位置には、一対の固定部22,22が設けられており、固定部22により形成される凹部25の内壁23は、ボイスコイル3を安定的に固定及び支持出来るように、ボイスコイル3の外周面に略平行で、該ボイスコイル3よりも少し大きい半径の曲面に形成されている。   A pole screw 21 that protrudes upward is disposed at a substantially central portion of the bottom surface 20 of the recess of the case base 2. The pole screw 21 is provided integrally with the case base 2, and the voice coil 3 is disposed around the pole screw 21. In addition, a pair of fixing portions 22 and 22 are provided at positions facing each other across the concave portion 25 of the case base 2, and the inner wall 23 of the concave portion 25 formed by the fixing portion 22 is formed by the voice coil 3. Is formed in a curved surface that is substantially parallel to the outer peripheral surface of the voice coil 3 and has a slightly larger radius than the voice coil 3.
振動板4の両端部44,44は、各固定部22の上面にそれぞれ固定されることにより、当該振動板4が前記ポールビス21を収納した凹部25の上側に架設される。固定部22の上面の高さは、ポールビス21の上面高さより少し高く形成されている。したがって、振動板4が固定部22,22間に架設された状態で、振動板4とポールビス21との間に一定の隙間が形成される。このように、ケース基台2はボイスコイル3などを固定及び支持する役割以外にもヨークの役割をすることによって、いくつかの構成部品を一つに簡略化される効果がある。   Both end portions 44, 44 of the diaphragm 4 are fixed to the upper surface of each fixing portion 22, so that the diaphragm 4 is installed above the concave portion 25 in which the pole screw 21 is accommodated. The height of the upper surface of the fixed portion 22 is formed to be slightly higher than the height of the upper surface of the pole screw 21. Therefore, a fixed gap is formed between the diaphragm 4 and the pole screw 21 in a state where the diaphragm 4 is installed between the fixed portions 22 and 22. Thus, the case base 2 has the effect of simplifying several components into one by acting as a yoke in addition to the role of fixing and supporting the voice coil 3 and the like.
このようにポールビス21にヨークの役割を兼用させるとともに、製造工程及び製造費用を最小化するために、ポールビス21は、金属材料を用いてケース基台2とともに一体成形されることが望ましい。具体的には、ムクの金属材料を切削加工したり、鋳造加工することにより成形できる。   Thus, in order to make the pole screw 21 also serve as a yoke and minimize the manufacturing process and the manufacturing cost, the pole screw 21 is preferably integrally formed with the case base 2 using a metal material. Specifically, the metal material can be formed by cutting or casting.
ボイスコイル3は、ケース基台2のポールビス21に結合される。ここで、ボイスコイル3の厚さ(高さ)は、ポールビス21の高さとほぼ同じ寸法に設定されている。したがって、ボイスコイル3及びポールビス21の上面と振動板4との間に一定の隙間が形成されている。   The voice coil 3 is coupled to the pole screw 21 of the case base 2. Here, the thickness (height) of the voice coil 3 is set to be approximately the same as the height of the pole screw 21. Therefore, a certain gap is formed between the upper surfaces of the voice coil 3 and the pole screw 21 and the diaphragm 4.
また、ボイスコイル3のコイル線の両端部は、底面20よりケース基台2の下面にまで延長され、図1に示すように、絶縁体26が介在されて設置された端子27に電気的に接続されている。この端子27を通じてボイスコイル3にサウンド信号が入力される。   Further, both end portions of the coil wire of the voice coil 3 are extended from the bottom surface 20 to the lower surface of the case base 2 and electrically connected to a terminal 27 installed with an insulator 26 interposed as shown in FIG. It is connected. A sound signal is input to the voice coil 3 through the terminal 27.
振動板4は、略平板状の部材より構成され、凹部底面20の形状と類似している略円形の振動領域4a及び固定部22の上面形状と類似する形状の固定領域4bを有しており、ボイスコイル3の上側に渡設され、該ボイスコイル3の離脱を防止する同時に所定の周波数で振動する。本例では、振動板4の固定領域4bに穿設された通孔42、42を貫通した取付ネジ43,43を、固定部22,22の上面に形成された螺孔24,24にそれぞれ固定することにより、該固定部22,22の上面間に架設されている。   The vibration plate 4 is formed of a substantially flat plate-like member, and has a substantially circular vibration region 4 a similar to the shape of the bottom surface 20 of the recess and a fixed region 4 b having a shape similar to the upper surface shape of the fixing portion 22. These are passed over the voice coil 3 to vibrate at a predetermined frequency while preventing the voice coil 3 from being detached. In this example, the mounting screws 43, 43 penetrating through the through holes 42, 42 formed in the fixing region 4b of the diaphragm 4 are fixed to the screw holes 24, 24 formed on the upper surfaces of the fixing portions 22, 22, respectively. By doing so, it is constructed between the upper surfaces of the fixing portions 22 and 22.
振動板4における振動領域4aの周縁部、すなわちマグネット5が取り付けられる中央位置40の周囲には、上下貫通した長穴41が周方向に沿って複数形成されている。このように振動領域4aに少なくとも一つの長穴41が形成されることにより、振動板4の振動効率又は骨伝導効率が向上する。本例では、長穴41が縦横対称の位置に計4本形成されているが、4本未満又は5本以上でも可能であり、その配列も三角形の各辺の位置、四角の各辺の位置、五角形の各辺の位置、六角形の各辺の位置、円形に沿った位置など、多様な形態が可能である。   A plurality of elongated holes 41 penetrating vertically are formed along the circumferential direction around the periphery of the vibration region 4a of the diaphragm 4, that is, around the central position 40 where the magnet 5 is attached. Thus, by forming at least one long hole 41 in the vibration region 4a, the vibration efficiency or the bone conduction efficiency of the vibration plate 4 is improved. In this example, a total of four long holes 41 are formed at vertical and horizontal symmetrical positions. However, the number of the long holes 41 may be less than four or five or more. Various forms such as the position of each side of the pentagon, the position of each side of the hexagon, and the position along the circle are possible.
マグネット5は、直方体であり、振動板4上面の振動領域4aの略中央位置40に固定され、ボイスコイル3と相互作用(引力又は斥力)する。このマグネット5は、長穴41,・・・で囲まれた内側の振動領域4aに固定されているが、この位置が振動の効率又は骨伝導の効率面で好適である。また、このマグネット5は前記の振動の効率又は骨伝導の効率を高めるために、ボイスコイル3の中心又はポールビス21の中心と対応される領域に形成されるのが望ましい。従って、従来はマグネットを多数が具備する必要があったが、本発明では一つだけで足りる。勿論、マグネット5の個数は何ら限定されず、2つ以上を用いることも可能である。また、形状についても、直方体以外に、三角柱、円柱、五角柱、その他の種々なる形状が採用できる。   The magnet 5 is a rectangular parallelepiped, is fixed at a substantially central position 40 of the vibration region 4 a on the upper surface of the diaphragm 4, and interacts with the voice coil 3 (attraction or repulsion). The magnet 5 is fixed to the inner vibration region 4a surrounded by the long holes 41,..., But this position is suitable in terms of vibration efficiency or bone conduction efficiency. The magnet 5 is preferably formed in a region corresponding to the center of the voice coil 3 or the center of the pole screw 21 in order to increase the vibration efficiency or the bone conduction efficiency. Therefore, conventionally, it has been necessary to provide a large number of magnets, but in the present invention, only one is sufficient. Of course, the number of magnets 5 is not limited at all, and two or more magnets can be used. In addition to the rectangular parallelepiped shape, a triangular prism, a cylinder, a pentagonal prism, and other various shapes can be employed.
一方、マグネット5の磁力線がボイスコイル3に向かうことが出来るように、マグネット5の上面から側面の少なくとも一部までを覆う金属製カバー6が設けられている。金属製カバー6は、特に、前記マグネット5の磁力線がボイスコイル3側に集中できるように前記カバー6は磁力線が貫通出来ない金属材質、たとえば磁性体材料より構成されており、前記マグネット5に被さる被覆部62と両側方に伸びる固定片63、63とより構成されている。蓋体7の内面のマグネット5に対応する位置には、金属製カバー6の被覆部62をマグネット5とともに受け入れる凹陥部70が設けられており、前記固定片63に穿設された通孔60を貫通した取付ネジ61を、蓋体7の内面側に形成した螺孔71に取り付けることにより当該内面側に固定される。
On the other hand, a metal cover 6 that covers from the upper surface of the magnet 5 to at least a part of the side surface thereof is provided so that the magnetic lines of force of the magnet 5 can go to the voice coil 3. In particular, the metal cover 6 is made of a metal material, such as a magnetic material, through which the magnetic lines of force cannot penetrate so that the magnetic lines of force of the magnet 5 can be concentrated on the voice coil 3 side, and covers the magnet 5. It is comprised from the coating | coated part 62 and the fixing pieces 63 and 63 extended on both sides. A concave portion 70 for receiving the covering portion 62 of the metal cover 6 together with the magnet 5 is provided at a position corresponding to the magnet 5 on the inner surface of the lid body 7, and a through hole 60 drilled in the fixing piece 63 is provided. By fixing the penetrating mounting screw 61 to the screw hole 71 formed on the inner surface side of the lid body 7, the mounting screw 61 is fixed to the inner surface side.
以上の構造を備えた本実施形態に係る骨伝導スピーカー1は、次のように作動する。   The bone conduction speaker 1 according to the present embodiment having the above structure operates as follows.
先ず、所定の音声信号に該当される電流信号がボイスコイル3へ伝達されると、ボイスコイル3が、マグネット5、ポールビス21、凹部内壁23との磁力又は引力によって、所定の周波数で振動する。   First, when a current signal corresponding to a predetermined audio signal is transmitted to the voice coil 3, the voice coil 3 vibrates at a predetermined frequency by the magnetic force or attractive force of the magnet 5, the pole screw 21, and the inner wall 23 of the recess.
ボイスコイル3の上部に位置する振動板4は、ボイスコイル3から固定部22を介して伝わる振動によって共に振動される。この際、振動板4には多数の長穴41,・・・が形成されているため、ボイスコイル3に比べてより大きな増幅で振動することとなる。   The diaphragm 4 located on the upper part of the voice coil 3 is vibrated together by the vibration transmitted from the voice coil 3 via the fixed portion 22. At this time, the diaphragm 4 is formed with a large number of elongated holes 41,..., And thus vibrates with greater amplification than the voice coil 3.
この振動板4の振動現象は、その上に装着されたマグネット5及び金属製カバー6に伝達され、蓋体7を介して人体の頭皮に伝達される。それにより、前記人体の頭蓋骨内の鼓膜や耳小骨に異常のある難聴者でも、蝸牛や聴覚神経が正常であれば確実に音を聞くことが出来る。   The vibration phenomenon of the diaphragm 4 is transmitted to the magnet 5 and the metal cover 6 mounted thereon, and is transmitted to the scalp of the human body through the lid body 7. Thereby, even a hearing-impaired person who has an abnormality in the eardrum or the ossicle in the skull of the human body can surely hear the sound if the cochlea and the auditory nerve are normal.
以上、本発明の実施形態について説明したが、本発明はこうした実施例に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲において種々なる形態で実施し得ることは勿論である。   Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.
上記のように構成された本発明の実施例の骨伝導スピーカー1から発生される磁気力の露出と、他の構造の比較例1〜3の骨伝導スピーカからの磁気力の露出を測定した結果について、図5、6にそれぞれ示す。   Results of measuring the exposure of the magnetic force generated from the bone conduction speaker 1 of the embodiment of the present invention configured as described above and the exposure of the magnetic force from the bone conduction speakers of Comparative Examples 1 to 3 of other structures. Are shown in FIGS. 5 and 6, respectively.
図5(a)は、図1〜4に示した実施例の骨伝導スピーカーの磁気力の露出測定の結果、図5(b)は、比較例1として、本出願人が先に出願した特願2005−334524号の骨伝導スピーカ、すなわちヨークに延長部を形成するとともにヨークに音声コイルと中央磁極を形成し、その上部に鉄片を付着させた振動板が固定され、その上部にマグネットを付着させた骨伝導スピーカの磁気力の露出測定の結果を示している。   FIG. 5A is a result of the measurement of the magnetic force exposure of the bone conduction speaker of the embodiment shown in FIGS. 1 to 4, and FIG. The bone conduction speaker of Japanese Patent Application No. 2005-334524, that is, an extension part is formed on the yoke, a voice coil and a central magnetic pole are formed on the yoke, and a diaphragm with an iron piece attached to the upper part is fixed, and a magnet is attached to the upper part The result of the exposure measurement of the magnetic force of the made bone conduction speaker is shown.
図6(a)は、比較例2として、上記比較例1の構造に加えて、更にマグネット上部に鉄板を載置した構造の骨伝導スピーカの磁気力の露出測定の結果、図6(b)は、比較例3として、特開2006−33787号公報に記載の骨伝導スピーカ、すなわちヨークの中央磁極にボイスコイルを装着し、ヨークの両側の短尺辺側端部上に前記マグネットを配置し、前記マグネット配置軸上の前記各マグネットの外側に振動板固定部を配置した骨伝導スピーカの磁気力の露出測定の結果を示している。   FIG. 6A shows, as Comparative Example 2, in addition to the structure of Comparative Example 1 above, as a result of measuring the magnetic force exposure of a bone conduction speaker having a structure in which an iron plate is further placed on the magnet. Is a bone conduction speaker described in JP-A-2006-33787 as Comparative Example 3, that is, a voice coil is attached to the central magnetic pole of the yoke, and the magnet is arranged on the short side end portions on both sides of the yoke, The result of the exposure measurement of the magnetic force of the bone conduction speaker which has arrange | positioned the diaphragm fixing | fixed part outside the said each magnet on the said magnet arrangement | positioning axis | shaft is shown.
図5、6の測定結果は、図中左側の半円中にドットが少ないほど磁気力が外部へ露出される量が少ないことを示している。また、図中右側の半円に磁力線の様子を示している。図5、6から分かるように、実施例では外部へ露出される磁気力が比較例1〜3に比べて著しく少なく、磁力線もほぼ収束している。よって、人体に及ぼす影響も減少されることが分かる。比較例1ではマグネット上方向への磁気力の漏れが多い。また、比較例2では鉄板を載せた分だけ漏れ量が減り、下方のヨーク側へ向かうように補完されているが、漏れ量があり理想的な磁気回路とはいえない。比較例3でも外方への漏れがあった。   The measurement results in FIGS. 5 and 6 indicate that the smaller the number of dots in the left semicircle, the smaller the amount of magnetic force exposed to the outside. In addition, the magnetic field lines are shown in the semicircle on the right side of the figure. As can be seen from FIGS. 5 and 6, in the embodiment, the magnetic force exposed to the outside is remarkably smaller than those in Comparative Examples 1 to 3, and the lines of magnetic force are almost converged. Therefore, it can be seen that the influence on the human body is also reduced. In Comparative Example 1, the magnetic force leaks upward in the upward direction of the magnet. Further, in Comparative Example 2, the amount of leakage is reduced by the amount of the iron plate placed, and the amount of leakage is supplemented so as to go to the lower yoke side. Even in Comparative Example 3, there was leakage to the outside.
本発明の代表的実施形態に係る骨伝導スピーカーを示す斜視図。1 is a perspective view showing a bone conduction speaker according to a representative embodiment of the present invention. 同じく骨伝導スピーカーを示す断面図。Sectional drawing which similarly shows a bone conduction speaker. 同じく骨伝導スピーカーを示す分解断面図。The disassembled sectional view which similarly shows a bone conduction speaker. 同じく骨伝導スピーカーを示す分解斜視図。The disassembled perspective view which similarly shows a bone conduction speaker. 実施例1、比較例1の磁気力の露出を測定した結果を示す図。The figure which shows the result of having measured the exposure of the magnetic force of Example 1 and Comparative Example 1. 比較例2、3の磁気力の露出を測定した結果を示す図。The figure which shows the result of having measured the exposure of the magnetic force of the comparative examples 2 and 3. FIG.
符号の説明Explanation of symbols
1 骨伝導スピーカー
2 ケース基台
3 ボイスコイル
4 振動板
4a 振動領域
4b 固定領域
5 マグネット
6 金属製カバー
7 蓋体
20 底面
21 ポールビス
22 固定部
23 内壁
24 螺孔
25 凹部
26 絶縁体
27 端子
40 中央位置
41 長穴
42 通孔
43 取付ネジ
44 端部
60 通孔
61 取付ネジ
62 被覆部
63 固定片
70 凹陥部
71 螺孔
DESCRIPTION OF SYMBOLS 1 Bone conduction speaker 2 Case base 3 Voice coil 4 Diaphragm 4a Vibration area 4b Fixing area 5 Magnet 6 Metal cover 7 Lid 20 Bottom 21 Pole screw 22 Fixing part 23 Inner wall 24 Screw hole 25 Recess 26 Insulator 27 Terminal 40 Center Position 41 Long hole 42 Through hole 43 Mounting screw 44 End 60 Through hole 61 Mounting screw 62 Covering part 63 Fixed piece 70 Recessed part 71 Screw hole

Claims (5)

  1. 略円形の底面を有する凹部が形成されたケース基台と、
    前記凹部の内に収納されるボイスコイルと、
    前記ケース基台における前記凹部の内壁を構成する固定部に取り付けられ、前記凹部に収納されたボイスコイルの上側に渡設される振動板と、
    該振動板の上面側の略中央位置に取り付けられたマグネットと、
    前記ケース基台の上部に前記振動板及び前記マグネットを介して取り付けられる蓋体とを備え、
    金属材料を用いて前記凹部の底面の略中央部より上方に突起するポールビスを当該ケース基台とともに一体成形して設け、該ポールビスの周囲に前記ボイスコイルを配置し
    前記蓋体の内面側に前記マグネットの上面から側面の少なくとも一部までを覆う磁性体からなる金属製カバーを設けてなることを特徴とする骨伝導スピーカー。
    A case base in which a recess having a substantially circular bottom surface is formed;
    A voice coil housed in the recess,
    A diaphragm attached to a fixed portion constituting the inner wall of the recess in the case base, and passed over the voice coil housed in the recess;
    A magnet attached at a substantially central position on the upper surface side of the diaphragm;
    A lid attached to the upper part of the case base via the diaphragm and the magnet;
    A pole screw that protrudes upward from a substantially central portion of the bottom surface of the concave portion using a metal material is integrally formed with the case base, and the voice coil is disposed around the pole screw .
    A bone conduction speaker, wherein a metal cover made of a magnetic material is provided on the inner surface side of the lid so as to cover at least a part of the side surface from the upper surface of the magnet .
  2. 前記蓋体の内面の対応する位置に、前記金属製カバーに覆われたマグネットを受け入れる凹陥部を設けてなる請求項記載の骨伝導スピーカー。 Corresponding to the position, the bone conduction speaker according to claim 1 wherein formed by providing a recess for receiving a magnet covered with the metal cover of the inner surface of the lid.
  3. 前記凹部の内壁面を、収納されるボイスコイルの外周面に略平行な曲面に形成してなる請求項1又は2記載の骨伝導スピーカー。 The bone conduction speaker according to claim 1 or 2, wherein an inner wall surface of the recess is formed into a curved surface substantially parallel to an outer peripheral surface of a voice coil to be accommodated.
  4. 前記振動板におけるマグネット取付位置の周囲に沿って、上下貫通した少なくとも1つの長穴を設けてなる請求項1〜3の何れか1項に記載の骨伝導スピーカー。 The bone conduction speaker according to any one of claims 1 to 3, wherein at least one elongated hole penetrating vertically is provided along a periphery of a magnet mounting position on the diaphragm.
  5. 前記凹部を挟み互いに対向する位置に一対の前記固定部を設け、前記振動板の両端部を各固定部の上面にそれぞれ固定してなる請求項1〜の何れか1項に記載の骨伝導スピーカー。 The bone conduction according to any one of claims 1 to 4 , wherein a pair of the fixing portions are provided at positions facing each other across the recess, and both end portions of the diaphragm are fixed to the upper surface of each fixing portion, respectively. speaker.
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